BPM heart rate index

Heart rate (BPM=beat per minute) refers to the number of beats per minute in the quiet state of normal people, which is generally 60 ~ 100 beats per minute. Individual differences may occur due to age, gender or other physiological factors.Generally speaking, the younger you are, the faster your heart rate will be, the older people will have a slower heart rate than the younger people, and the women will have a faster heart rate than the men of the same age. These are all normal physiological phenomena.In the quiet state, the normal heart rate of adults is 60 ~ 100 beats per minute, and the ideal heart rate is 55 ~ 70 beats per minute (the heart rate of athletes is slower than that of ordinary adults, generally around 50 beats per minute).There are two common principles of heart rate measurement, one is the cardiac current measurement method, and another is the photoelectric transmission measurement method

1. The wireless heart band is a device that can sense the electrical current generated by each heartbeat.The electrode of the sensor is located on both sides of the front of the chest belt. After it is put on the chest belt, the electrode in the chest belt collects the fluctuation amplitude of the cardiac current of the exerciser, and then sends it to the heart rate meter through wireless transmission technology to convert it into the heartbeat BPM value that is easy to observe. At present, this is a mainstream and relatively accurate exercise heart rate measurement method.The principle is consistent with that of ECG measurement. Another advantage of this method of heart rate measurement is that it can be continuously measured during exercise

2. The wireless heart rate belt can be divided into traditional hard heart rate belt and new flexible fabric chest belt according to the type of induction electrode.

The hard heart belt uses conductive rubber electrodes embedded in hard plastic tape.Flexible fabric flexible heart belt adopts flexible film electrode, which is fused to the flexible fabric belt by hot pressing. It is characterized by very thin and light weight, comfortable to wear, and reduces the friction and interference caused by the movement of the chest belt during exercise.

The photoelectric method uses the change in the absorbance of hemoglobin in blood vessels to measure the pulse.The watch is equipped with infrared emitting beam loop and receiving and reflecting loop.This simple way to measure the heart rate advantage is no chest, but because the signal is very weak and very vulnerable to interference caused by inaccurate measurement data and generally need quiet state measurement, not suitable for sports continue to measure heart green photoelectric measurement is made up of two green wavelengths of light LED and a photosensitive sensor, is located in the back of the heart rate table.The idea is that the density of blood in the blood vessels of the arm changes as it pulsates, causing changes in light transmittance. Leds emit light at green wavelengths, and photosensitive sensors can pick up reflected light from the skin on the arm and detect changes in the intensity of the metering field, which translates into heart rate.The iWatch currently uses this technology.The green photoelectric heart rate measurement completely abandoned the heart rate chest band, and can continuously measure the heart rate, calculate the average heart rate, record the maximum heart rate, and set the heart rate alarm interval.